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我在BuildConfig.groovy文件的repositories{...}块中定义了以下自定义解析器，以便我可以在我的Grails项目中获得使用JAI所需的JAR。自定义Ivy解析器在Grails中引发NullPointer异常
mavenRepo "http://www.mygrid.org.uk/maven/repository"
def jbossResolver = new org.apache.ivy.plugins.resolver.URLResolver()
jbossResolver.addArtifactPattern("https://repository.jboss.org/nexus/content/groups/public-jboss/com/sun/media/[module]/[revision]/[artifact]-[revision].[ext]")
jbossResolver.addArtifactPattern("https://repository.jboss.org/nexus/content/groups/public-jboss/javax/media/[module]/[revision]/[artifact]-[revision].[ext]")
jbossResolver.setName("AwesomestJbossResolverEver")
resolver jbossResolver
但是，每当我会跑grails refresh-dependencies，我会得到这个错误：
compile (
"net.java.dev.jai-imageio:jai-imageio-core-standalone:1.2-pre-dr-b04-2013-04-23",
"javax.media:jai-core:1.1.3",
"com.sun.media:jai-codec:1.1.3"
)
的JAI-ImageIO的核心 - 独立从http://www.mygrid.org.uk/maven/repository位置解决就好了，但回力核心， JAI编解码器的文件保存引发此错误：
| Error Failed to resolve dependencies (Set log level to 'warn' in BuildConfig.groovy for more information):
- javax.media:jai-core:1.1.3
- com.sun.media:jai-codec:1.1.3
随着一些详细的日志记录，我发现了这个错误：
tried https://repository.jboss.org/nexus/content/groups/public-jboss/com/sun/media/jai-codec/1.1.3/jai-codec-1.1.3.jar
null: no ivy file found for com.sun.media#jai-codec;1.1.3: using default data
problem occurred while resolving dependency: com.sun.media#jai-codec;1.1.3 {compile=[default]} with null: java.lang.NullPointerException
at java.util.Hashtable.put(Hashtable.java:394)
at java.util.Properties.setProperty(Properties.java:143)
at org.apache.ivy.core.cache.DefaultRepositoryCacheManager.saveResolvers(DefaultRepositoryCacheManager.java:422)
at org.apache.ivy.core.cache.DefaultRepositoryCacheManager.originalToCachedModuleDescriptor(DefaultRepositoryCacheManager.java:875)
......long stack trace here.........
at java.lang.reflect.Method.invoke(Method.java:597)
at org.codehaus.groovy.grails.cli.support.GrailsStarter.rootLoader(GrailsStarter.java:234)
at org.codehaus.groovy.grails.cli.support.GrailsStarter.main(GrailsStarter.java:262)